3863080

Appears in sequences

• Number of unrooted triangulations with reflection symmetry of a disk with one internal node and n+3 nodes on the boundary.at n=25A005508
• Twelfth column of Losanitsch's triangle A034851 (formatted as lower triangular matrix).at n=15A062136
• Expansion of (1+x^2*C^2)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=13A071721